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Numerical Investigation of Icing Effects on Dynamic Inlet Distortion

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Abstract

The effect of the simulated ice accretion on the dynamic distortion of a diffusing S-duct inlet is numerically investigated. The LES turbulence model is used to simulate the unsteady flow separation and vortex shedding from the duct curvatures and ice accretion. The numerical methods for unsteady-flow solutions are validated with the wind-tunnel test data for dynamic inlet distortion. The results show that the protruding glaze ice horns create the strong vortex shedding structures that produce additional flow unsteadiness at the inlet engine face. In particular, the symmetrical glaze ice that uniformly covers the entire inlet lip increases the total pressure loss and fluctuation level more than the asymmetrical glaze ice with a less blockage to inlet flow. Furthermore, the symmetrical glaze iced inlet induces 17 times more severe instantaneous peak distortion than clean inlet at the free stream Mach number of 0.34.

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Abbreviations

\(D_{\mathrm{th}}\) :

Throat diameter (m)

LES:

Large eddy simulation

LWC:

Liquid water contents \((g/m^{3})\)

\(M_{\mathrm{th}}\) :

Throat Mach number of baseline inlet \((\sim )\)

MVD:

Mean volume diameter (\(\mu \)m)

\(M_{\infty }\) :

Free-stream Mach number (\(\sim )\)

PD:

Peak distortion parameter (\(\sim )\)

Ps:

Static pressure (kPa)

\(Pt_{\mathrm{{PD}}}\) :

Total pressure at peak distortion (kPa)

\(Pt_{\infty }\) :

Free-stream total pressure (kPa)

\(\overline{\mathrm{Pt}} _{\mathrm{ef}} \) :

Area- and time-averaged total pressure at engine face (kPa)

\(\overline{\mathrm{Pt}} _{\mathrm{ef-clean}}\) :

Area- and time-averaged total pressure at engine face of clean inlet (kPa)

\(\overline{\mathrm{Pt}} _{\mathrm{ef-INS}}\) :

Instantaneous area-averaged total pressure at engine face (kPa)

\(\overline{\mathrm{Pt}} ^{{\prime }}\) :

Area-averaged total pressure fluctuation at the engine face (kPa)

\(\overline{\mathrm{Pt}} _{\mathrm{RMS}}^{\mathrm{\prime }} \) :

Root mean square of total pressure fluctuation at engine face (kPa)

\({\overline{\mathrm{Q}}}_{\mathrm{ef}}\) :

Area-averaged dynamic pressure at engine face (kPa)

RMS:

Root mean square

\(T_{\infty }\) :

Free-stream static temperature (\(^\circ \)C)

\(\Delta \)t:

Time step size (s)

\(V_{\infty }\) :

Free-stream velocity

\(y^{+}\) :

Non-dimensional wall distance \((\sim )\)

\(\theta \) :

Circumferential angle (deg.)

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Acknowledgements

This work was supported by INHA TECHNICAL COLLEGE Research Grant.

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Authors and Affiliations

  1. Department of Aircraft Mechanical Engineering, INHA Technical College, Incheon, 22212, Republic of Korea

    Wonjin Jin

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  1. Wonjin Jin
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Correspondence to Wonjin Jin.

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Jin, W. Numerical Investigation of Icing Effects on Dynamic Inlet Distortion. Int. J. Aeronaut. Space Sci. 19, 354–362 (2018). https://doi.org/10.1007/s42405-018-0044-0

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